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Yes you can do this - it's not set in concrete until you close and sign the paperwork.
Just contact your LO and tell him what you want to do. He will have to resubmit to u/w but since you have all the info supplied and have been approved it shouldn't take long at all.
the loan officer can pre-approve you for whatever scenario you want.....
The loan officer was able to change the terms for my mortgage in 3 days. Thanks for your helpful information!